No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $45.5M — a different platform, not this one.

XCOM® 2

XCOM 2 is the sequel to XCOM: Enemy Unknown , the 2012 award-winning strategy game of the year. Earth has changed. Twenty years have passed since world leaders offered an unconditional surrender to alien forces. XCOM , the planet’s last line of defense, was left decimated and scattered. Now, in XCOM 2 , the aliens rule Earth, building shining cities that promise a brilliant future for humanity on the surface, while concealing a sinister agenda and eliminating all who dissent from their new order. Only those who live at the edges of the world have a margin of freedom. Here, a force gathers once again to stand up for humanity. Always on the run, and facing impossible odds, the remnant XCOM forces must find a way to ignite a global resistance, and eliminate the alien threat once and for all. XCOM ON THE RUN: Take command of the Avenger, an alien supply craft converted to XCOM’s mobile headquarters. New open-ended gameplay lets you decide where to guide your strike team, how to grow popular support, and when to combat enemy counter-operations. RECRUIT RESISTANCE FIGHTERS: Five soldier classes, each with its own skill tree, let you create specific soldiers for your tactical plan. TACTICAL GUERRILLA COMBAT: New gameplay systems offer more tactical flexibility in combat. Use concealment to ambush enemy patrols. Loot enemies for precious gear and artifacts. Rescue VIPs and save fallen comrades by carrying them to the extraction point. A NEW BREED OF ENEMY: A diverse cast of enemies from powerful new alien species to the ADVENT, enforcers of the alien regime, offer a distinct tactical challenge. RESEARCH, DEVELOP AND UPGRADE: Configure and build rooms on the Avenger to give XCOM new capabilities on the battlefield. Use your Scientists and Engineers to research, develop and upgrade weapons and armor to fit your preferred tactics. EACH MISSION IS A UNIQUE CHALLENGE: Go on missions around the world, from wildlands to the heart of the alien-controlled megacities, to the depths of alien installations. There are virtually infinite combinations of maps, missions and goals.